Divided hollow rivet with expanding means



Aug. 4, 1953 L. c. HUCK DIVIDED HOLLOW RIVET WITH EXPANDING MEANS Filed Sept. 8, 1948 0! c M a .5. J. a a 4 Patented Aug. 4, 1953 DIVIDED HOLLOW RIVET WITH EXPANDING MEANS Louis C. Huck, Detroit, Mich., assignor to Huck Manufacturing Company, Detroit, Mich., a corporation of Michigan Application September 8, 1948, Serial No. 48,242

2 Claims.

1 The present invention relates to improvements in fasteners, and particularly to fasteners having flush heads for securing panel members, or the like, together.

One of the primary objects of the present invention is to provide an improved fastener having a plurality of interfitting members in which the members are locked together and are firmly secured to the panels or the other members with which the fastener is used.

A further object of the invention is to provide an improved fastener which securely holds a pair of panels together and which will maintain such firm hold in use when subjected to continuous vibration.

A further object of the invention is to provide an improved fastener which may be used to hold panels together in which there may be variation in the thickness of the panels and, consequently, variation in the length of the bore through which the fastener passes.

Another object of the invention is to provide a simplified fastener which is economical to manufacture, and which may be readily applied.

Other objects of the invention will become apparent from the following specification, the drawing relating thereto, and from the claims hereinafter set forth.

In the drawing in which like numerals are used to designate like parts in the several views throughout:

Figure 1 is a cross-sectional View of a plurality of panels to be fastened together by the fastener of the present invention, such fastener being shown partially in elevation and partially in cross-section, and with the elements of the panel separated prior to assembly.

Fig. 2 is a view similar to Fig. 1, but showing the fastener elements in an intermediate stage of assembly;

Fig. 3 is a view similar to Fig. 1 and showing the fastener element in its final locked position.

The fastener of the present invention is particularly adapted for securing a plurality of wooden panels together; but it will be appreciated that it is not limited to such use, and will be equally useful in other applications.

Referring to the drawing, a pair of panels I and 2 are shown, such panels being plywood panels in the embodiment illustrated, and having thin metal sheets 3 and 4 secured on the exterior surfaces thereof. In the embodiment illustrated such sheets 3 and i are aluminum, but may be other metals. Metal strips or plates 5 and 6 are disposed on the outside surfaces of the composite panels I and 2. The composite panels and 2, and the strips 5 and 6, have aligned openings therethrough providing a bore '1. The opening in the strips 5 and 6 terminate adjacent their outer faces in countersinks 8 and 9.

A fastener, generally indicated at it, is adapted to be received within the bore 1, and when in its final assembled position, as shown in Fig. 3, to securely hold composite panels I and 2 and the strips 5 and 6 together.

The fastener It comprises three parts; a female part II, a male part I2, and a lock pin IS.

The female part I l is circular in cross-section and has a tubular portion i4 having one end open, and terminating in a conical base 15 adjacent a solid portion it of the rivet which joins with the rivet head Ill. The head H is preferably flat, so that it will be flush with the surface of the strip 5, and is tapered complementary to the taper of the countersink 8. The exterior diameter of the tubular portion of the female member II is such as to provide a close fit with the bore 1. The length of the female member I i is the same, or slightly less than, the length of the bore l.

The male member I2 is circular in cross-section and has a tubular inner end [B terminating in a tapered base 49 adjacent the solid portion 29. The solid portion 20 joins with a solid head 2|, the exterior surface of which is flat so that it will be flush with the surface of the strip 6, and having a tapered form complementary to 'the countersink 9. The tubular and solid parts of the rivet are of such diameter as to be telescopically received within the bore of tubular portion I l of the female member and joins the head at the annular shoulder 22.

The lock pin I3 has symmetrical, cylindrical end portions 23 and 24 and an intermediate enlarged cylindrical portion 25 which is joined to the end portions 23 and 24 by tapered portions 26 and 2?, respectively. The symmetrical ends allow reversability in positioning the lock pin in the male member.

The cylindrical end 24 is telescopically received within the adjacent tubular end of the male member 12, and a tight fit is preferably provided so that the male member l2 and the lock pin I3 are held together as a sub-assembly for the final assembly.

As shown in Fig. l, the female member H is positioned within the bore 1 and with the head I! flush with respect to the strip or plate 5. The lock pin 13 is assembled with the male member, as shown, and movement of this subassembly in the direction of arrow A will position the male member 12 within the female member II in the position shown in Fig. 2, so that in such position the male and female members are assembled and ready for driving. In this position, the end 23 of the lock pin I3 has abutted against the base it.

Further driving of the male member H in the direction of the arrow B causes relative movement of the male member [2 into the female member I l to the final assembled and locked position shown in Fig. 3. In moving to such final position, the lock pin [3 is forced into the bore of the male member [2 so that the edge of the tubular portion I8 is forced over the taper l2, the cylindrical portion 25, and down around the taper 26 over a portion of the end 23. At the same time, the embracing portion of the female member H is similarly distorted or bulged out so that the final form substantially assumes that shown in Fig. 3. It will be appreciated that the wooden panels are compressible, so that those portions of the panel adjacent the bulged out portions of the male and female members will be compressed to permit this distortion.

The effect is to provide bulbed-cut, interfitting portions on the central regions only of the male and female members, on both sides of the central enlarged portion 25 of the lock pin, and a positive lock against relative axial movement of the male and female members is thus provided.

The heads I? and 2i are substantially with the adjacent surfaces of the strips or plates and 6. It is pointed out that the bore of the tubular portion I8 is of such a length, and the length of the female member ii is such, that spaces 28 and 29 remain in the final assembly. The extent of such spaces, and within the limits of such spaces, will permit firm securing of panel members Where there may be variations in thick" ness thereof.

While only one specific embodiment of the present invention has been illustrated, changes may be made in the embodiment described without departing from the spirit and substance thereof, the scope of which is commensurate with the appended claims.

What is claimed is:

1. A fastener comprising a female member including a head and a shank having a cylindrical recess extending axially inwardly of the end thereof remote from said head, a male member including a head and a cylindrical shank slidably fitting said cylindrical recess and having a cylindrical recess extending inwardly of the end thereof remote fromthe head of said male member, and a locking element having cylindrical end portions adapted to slidably fit said recess in said male member and an intermediate enlarged portion, the depth of said cylindrical recess in said male member being greater than the combined lengths of one of said end portions and said intermediate portion, the depth of said cylindrical recess in said female member being greater than the combined lengths of the other of said end portions and said intermediate portion, and the length of said shank of said male member being greater than the depth of said recess in said female member less the length of the other of said end portions of said locking element, so that, upon telescopic movement of said male member into said female member with said locking element mounted on said male member with said one of said end portions received in said recess in said male member, said locking element will engage said female member at the inner end of said recess and the portion of the shank of said male member adjacent said other end thereof will be forced over said enlarged intermediate portion of said locking element and received over a part of said other end portion of said locking element.

2. A fastener comprising telescoping male and female members each including a shank, a head at one end of each said shank, and a recess extending inwardly of the other end of the shank, said recess of said female member being of similar cross section to and adapted to slidably receive said shank of said male member, and a locking element having end portions similar in cross section to and adapted to be slidably received in said recess in said male member, said locking element having an intermediate portion of substantially larger cross section than said recess in said male member, said locking element being adapted to be mounted in said male member with one of said end portions received in the recess thereof, said recess in each of said members being of a depth greater than the combined lengths of the one of said end portions extending toward the head of said member and said intermediate portion of said locking element respectively, and said shank of said male element being of a length greater than the depth of said recess in said female member less the length of the other of said end portions of said locking element. 

